Simply Detailed Parameters : 1. Basic size (ODxIDxT) :70x45x20/20mm 2. Material: SKD11 3. Hardness: 58-59HRC To get a quote or more details sooner about this bottom knife, please email us at phoebe@lcblade.com OR whatsapp +86 13399550005 Eccentric slitting bottom knife is different from normal screw bottom knife. And the advantages are distinct: Much easier adjustment; No harm to knife shaft; Higher precision than screw bottom knife; Tighter fitting.